I Have An 81 Monte Carlo With A Prteey Stout 327, Tci Full Manual Th350 And A 3k Stall Converter. I Plan On Running 4.56 Gears But For The Time Being I Am Just Going To Weld The Stock Unit. (not A Big Fan Of It Or The Stock Gears) But Id Like To Drive It N Atleast Be Able To Enjoy My Hard Work And Money. My Question Is As U All May Know These Are Some Pueney Little Rear Ends In Here. Should A Welded Stock Unit Be Able To Hold Up For A Little While Say Maybe 6months? Also Im Runnin 12" Rubber Out Back. Thanks For Any Advice. Oh And Also Im Told Some Montes Came 200r4. If I Can Find A Drive Shaft From A 200r4 Car It Should Bolt Right In Mine Correct?

If the tires don't hook it will last awhile, if they do...it is a crap shoot as to how long. A drive shaft from a TH 350 is a bolt in as will the 200r4's. You will have to fab or buy a cross member as they are different for the 200.
I had a 80 Monte, was a turbo car then switched to a 355. I picked up the 200r4, the cross member, and the 3.73 from a 88 Monte SS and transplanted them. My turbo Monte came with a TH 350, I used the drive shaft from it. I looked at a Monte with a 200r4 for the cross member mount locations bent up some 1/8" plate and bolted it to the frame. The driver side uses the same mount location.
There are aftermarket cross members that are set up for dual exhaust, I ran mine side by side down the one side. You would still need to fab a mount for the passenger side of the cross member.

if this is a street car are you really shure you want to do that,a locked diff can be dangerous a split second quick hard right and you could roll that car over.but if its a drag car you can weld it up but theres the right way and the wrong way to do it.alot of people weld the spiders solid thats not how to do it.remove the spider gears 2 pinion and 2 side gears,clean them up real good.take the side gears and mig weld them between 2 of the teeth 1 on each gear only.reassemble them opposed to each other so you still get 3/4 diff action before they lock this way it wont be so bad making a turn.

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.

Password:

Confirm Password:

Email Address

Please enter a valid email address for yourself.

Email Address:

Log-in

User Name

Remember Me?

Password

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.